Since MoinMoin release 1.9, we have two ways to create slide shows. You can either have your slideshow defined on a single wiki page with level 1 headings separating your slides, or you can have multiple (likely numbered) pages with 1 slide per page.

Single page slide show: defining it

Just create a wiki page and use level 1 headings to define/separate your slides.

At the very top of the page, you can optionally use #pragma date ... and #pragma author to set the date and author it will show in the slide's footer later.

Maybe you also want to put a link to the SlideShow action there (see example below).

Single page slide show: showing it

The SlideShow action is only supported for the modernized theme.

To start the slide show, select SlideShow from the "More Actions" menu or click on the action link if you have defined one.

Moving through your content / slides works by different means:

use the up and down arrow keys to scroll up and down within the content of a single slide

use the left / right arrow keys to move to previous / next slide

alternatively, click on the grey navigation links at the top of the screen

When preparing a presentation, better do that with the same screen resolution and browser / browser settings as you will use later for the presentation. For some browsers, you can use the browser's builtin zooming feature to adjust the size of the content rendering to your needs. Currently, better try to fit all content onto the slide without needing vertical scrolling (it might look a bit ugly if you put too much on a slide).